Glossary
Level Measurement Terms
Level terms: hydrostatic and DP level, wet and dry legs, radar, ultrasonic, displacer, switches, tank volume and ullage.
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All Level Measurement Terms
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TermBlocking DistanceBlocking distance is the zone just below an ultrasonic or radar sensor where it cannot measure,…FormulaBubbler Level MeasurementBubbler level measurement pushes a small gas flow out of a dip tube; the back pressure equals…FormulaCapacitance Level ProbeA capacitance level probe measures level from the change in capacitance as liquid replaces air…εrDielectric ConstantDielectric constant is the relative permittivity of a material; it sets how strongly a liquid…FormulaDished HeadA dished head is the curved end of a vessel, such as a 2:1 ellipsoidal or torispherical head,…FormulaDisplacer Level TransmitterA displacer level transmitter measures level from the buoyancy force on a heavy cylinder partly…FormulaDP Level MeasurementDP level measurement uses a differential pressure transmitter between a bottom tap and a top…TermDry LegA dry leg is a low side impulse line that stays full of gas, used for DP level when the vapour…
TermFalse Echo SuppressionFalse echo suppression teaches a radar or ultrasonic transmitter to ignore echoes from fixed…FormulaFloat Level SwitchA float level switch uses a buoyant float that rises and falls with the liquid to operate a…GWRGuided Wave RadarGuided wave radar sends microwave pulses down a rod, cable or coaxial probe and measures the…FormulaHydrostatic Level MeasurementHydrostatic level measurement finds liquid level from the pressure at the bottom of a tank and…FormulaInterface LevelInterface level is the height of the boundary between two liquids of different densities in a…TermLevel BridleA level bridle is an external vertical pipe connected to a vessel at two points, holding level…FormulaLoad Cell Tank WeighingLoad cell tank weighing measures the mass of a vessel contents from load cells under its supports.TermMagnetic Level GaugeA magnetic level gauge shows level with coloured flaps turned by a magnetic float inside a…
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TermOverfill ProtectionOverfill protection is the set of alarms, independent level switches and automatic actions that…TermPoint Level MeasurementPoint level measurement detects whether liquid or solid is present at one fixed height, giving…FormulaRadar Level TransmitterA radar level transmitter measures level from the travel time of microwaves reflected from the…TermRadiometric Level MeasurementRadiometric level measurement uses a gamma source and a detector outside the vessel; the liquid…TermSight GlassA sight glass is a glass gauge on a vessel that lets operators see the liquid level directly.SGSpecific GravitySpecific gravity is the density of a liquid divided by the density of water at a reference…TermStilling WellA stilling well is a vertical perforated pipe inside a tank that calms the liquid surface for…TermTank Strapping TableA tank strapping table converts measured level into volume for a specific tank, from its…
FormulaUllageUllage is the empty height or volume above the liquid in a tank, measured from the reference…FormulaUltrasonic Level TransmitterAn ultrasonic level transmitter measures level from the time sound pulses take to travel to the…FormulaVessel Holdup TimeVessel holdup time is how long the volume between two levels lasts at a given flow, used to set…TermVibrating Fork Level SwitchA vibrating fork level switch detects liquid when the frequency of its vibrating tines drops as…FormulaWet LegA wet leg is a low side impulse line kept full of liquid, used for DP level where vapour would…
Frequently Asked Questions
What does the level measurement glossary cover?
Level terms: hydrostatic and DP level, wet and dry legs, radar, ultrasonic, displacer, switches, tank volume and ullage.
Are the formulas checked?
Yes. Formulas follow the relevant standards such as ISO 5167, and every worked example is calculated and checked.
Other Glossary Sections
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